Experts from a wide range of fields such as Sociology, Philosophy, Urbanism or Art analyzed how the ideology of terror, that gathered strength after 11 September 2001 terrorist attacks, is affecting people flows, freedom of movement and the concept of city as a public and shared space for communications and creation. Stephen Graham is an expert on this issue and the author of the concept "passage-point urbanism", an idea to explain how cities turn into nets with passage points (sometimes invisible points) in order to track and monitor the public and private activity of its inhabitants.